Will a perfect backswing find a perfect impact or downswing path? - No. So that's why understanding and becoming good at the 430 entry will find the perfect backswing for you.
Most golfers are under the wrong impression as to when and where speed of the clubhead comes from. It's why mastering the 430 release is not only a key to straighter shots but also longer shots too.
There are many putting aids designed to help you build a better stroke. In this video I show you what the best advice is to keep the stroke on the perfect plane and arc.
Speed and control come from proper use of both arms. The left arm/hand should be classified as the rudder that steers the ship (the clubface) in the right direction. The right hand and arm supply extra power.
Here is a video about the way golf clubs are setup. The length factor is something no-one talks about or even considers. But it is hurting a lot of people's games.